Patent GB-191410070-A (GB)
Title: Improvements in Molding Machines.
Inventor: LEWIS WILFRED
IPC: B22C15/10
Filed: 1914-04-23
Granted: 1914-12-10
Abstract: 10,070. Lewis, W. Jan. 9, [Convention date]. Moulding - machines, in which the sand is packed by jarring the mould support against a floating anvil, utilize the anvil as a piston in connexion with auxiliary mechanism for first rocking over the flask support on to a mould table and then drawing t h e pattern. Special arrangements of inlet and exhaust valves are described. Jarring occurs by contact at B<3>, Fig. 3, and at B<7>, Fig. 6, leather or like washers being provided. For jarring, pressure is admitted at M<3>, Fig. 3, to a casing M carried in the interior of the piston D<1> attached to the flask support D. A detachable spider M<4> permits the valve casing to be withdrawn when necessary. The piston D<1> works in a cylinder formed in the upper portion of the anvil B, cushioned at C and formed at its lower portion as a piston working in a chamber A<1> formed in the machine base. A lift valve P, Fig. 6, is held open at t h e rest position or lower limit of movement of the piston by the perforated strut R engaging a piston Q working in a cylinder P<4> formed on the stem of the valve P. The chamber A<1> is open to atmosphere and is in communication with the cylinder P<4> by passages Q<2>, Q<3> and check valves B<12>, V. During the up-stroke of the piston D', the valve P is held open by the pressure air acting on the piston Q through ports P<3>. When the piston Q has made its full stroke, the valve P closes, and ribs D<5> on the piston D' move a valve S to permit exhaust by the ports B<15>, B", the valve V, and the chamber A<1>. At the close of the in-stroke of the piston D', a shoulder D<6> closes the valve S which is formed as a split ring and is prevented from rotating by pins D'. The check valve V prevents flow of air to the jarring- cylinder when the cylinder A' is connected to pressure for flask-inverting and pattern-withdrawing purposes. In a modification, the check valves are replaced by the valve VA, Fig. 10, and the admission valve PA has its lift limited by a ported washer P<10>. It is held open at the lower limit of the piston D<1> by the piston-rod Q<5>, which maintains the admission during the out-stroke by pressure air admitted at O<7>, Q<6> below the piston QA, connected above to atmosphere at B<22>. In a further modification, the admission valve is seated by a spring M<27>, Fig. 11, which yields when pressure air is supplied to the casing M<10>. Closing of the valve against this pressure is effected by a pressure supply M<28> controlled by a valve (not shown) actuated by the piston D'. The table E is pivoted at E', Figs. 3 and 5, and is linked at F to members G pivoted at G' to the anvil and linked at H to a yoke H<1>, which comes into contact with a projection A<2> when the anvil has risen beyond its highest position attained during jarring. Srch contact causes the table E to rotate to the position shown in Fig. 4. The anvil is then allowed to descend, and a ram J, supplied with liquid from a reservoir connectable also to air pressure, acting through a telescopic rod I, rotates the table to the position shown in Fig. 5. The head of the ram then contacts with a sleeve on the anvil, and the ram is then allowed to descend with the anvil, the weight of the flask &c. completing the inversion. During such movement, the rod I extends freely. A sleeve loose on a headed rod J<3> attached to the ram, passes quickly through the orifice A<9> under the influence of the pressure liquid on the up-stroke, but exercises a throttling effect on the down-stroke, enabling the stops E<5>, Fig. 3, to seat gently against the projection D<8>. Spring plungers G<3> carried by the members G then contact with the links H, and, as soon as the anvil has descended sufficiently to relieve the friction between the yoke H<1> and projection A<2>, they swing the yoke clear of the projection. The anvil may then be raised to draw the pattern, the ram assisting to give a slow steady draw. An adjustable projection A3 engages the yoke at the end of the draw and causes the return of the table E to its original position. Clamping flasks.-During jarring and inverting, the flask is clamped to the table E by pivoted clamps Y, Fig. 8, adjustable in length at Y<5> and operated by sliding a plate Y<7> in contact with the slotted lugs on the table. In a modification, additional clamping is provided by an eccentricended lever Y<50>.